Resources General PDFs About the Company PamphletArmorform AdvantageStatement of Qualifications ARMORFORM® Styles Armorform Principle StylesArticulating Block MatFilter Point MatUniform Section MatArmor Bags Installation Armorform Installation Methods Frequently Asked Questions Q: What is the Life Expectancy of the Fabric? A: The fabric serves two primary functions. A temporary form while the concrete sets and a filter that allows water to release while retaining cementitious material and aggregates. Therefore, life expectancy is immaterial. Q: What Happens to the Fabric When It Degrades? A: A phenomenon known as the "case-hardening" effect is a result of a higher percentage of the cement in the cement-rich, fine aggregate concrete mix being drawn to the surface of the fabric forms by the expelled excess mixing water. This layer of concrete impregnates the woven fabric, permanently adhering the fabric to the concrete and assisting with the prevention of ultraviolet degradation. As a result, it is uncommon for the fabric to break down. Empirical evidence shows the fabric is still in place decades after installation. Q: Is Nylon an Advantage Over Polyester Fabric? A: No. Research has shown that alkalinity can affect polyester at elevated temperatures and long-term exposure, but because concrete sets in as little as 30 minutes and the temporary nature of the fabric forms, there are no negative effects under these conditions. Q: What is the Steepest Slope That Ffc Can Be Installed on? A: It is generally recommended that manufactured revetments are installed on a 2:1 or flatter slope. However, it is not uncommon to see revetments installed on 1.5:1 or even greater slopes if slope and hydraulic stability can be maintained. Q: Do FFC revetments stabilize a slope? A: Surface-applied revetments do not address slope stability, but instead provide protection to slope erosion and bed degradation. Proper slope design and compaction are required. Q: Do Ffc Revetments Stabilize a Slope? A: Surface-applied revetments do not address slope stability but instead provide protection to slope erosion and bed degradation. Proper slope design and compaction are required. Q: Are Anchors Required to Counteract Hydraulic Forces? A: No, the FFC is designed so that the unit weight can resist uplift, drag, and sliding. Staples or anchors are only used in extreme cases where the FFC weight is not sufficient to resist hydraulic forces. Q: Can FFC Be Installed Underwater? A: Yes. Various installation methods are available depending on the depth, volume, flow, and velocity of the water. Q: Why is the Fabric Quantity More Than the Pumped Quantity? A: During the pumping process, the fabric contracts as it is filled. This contraction averages 10% in each direction. Q: How Large Are Your Mats? A: Unlike precast ACB mats, each project is designed specifically to the installed dimensions given. Individual panels can range from 5,000 ft2 to 8,500 ft2. These individual panels are then field-connected with zippers or stitching to generate one single "mat." Q: Does an FFC Require a Filter Fabric Underlayment? A: Depend on the selected style. Both the ABM and FPM mats require filter fabric, while it is suggested for USM as well. Q: How Does the Cost Compare to Conventional Methods or Alternatives? A: Installation costs vary greatly due to concrete and labor prices, as well as the logistical nature of the project, but in general, FFC installation is 30% less than rip rap, precast ACBs, concrete cloth, HydroTurf, or gabion mattresses.